Street market
A street market or open-air market is a market that is set up on certain days of the week, generally on the street in open-air places; they are usually located in public places or ceded by the town council of the locality such as squares, avenues, parking lots, etc. However, it can traditionally be set up in a market square or in a market town such as Camden Town.

A street market or open-air market is a market that is set up on certain days of the week, generally on the street in open-air places; they are usually located in public places or ceded by the town council of the locality such as squares, avenues, parking lots, etc. However, it can traditionally be set up in a market square or in a market town such as Camden Town.
Check the official site before travelling; hours and prices can change.
More markets

Borough Market
London's defining food market — go early Saturday, eat your way around the perimeter.

Columbia Road Flower Market
Sunday-only flower market in the East End — 8 a.m. for choice, 2 p.m. for prices.

Maltby Street Market
Borough's smaller, scruffier sibling — railway arches, weekend only.
Source: wiki-list